Enhanced degradation of Bisphenol A from high saline polycarbonate plant wastewater using wet air oxidation

Abstract

a b s t r a c tIn the present study, wet air oxidation (WAO) was investigated for the decomposition of bisphenol A (BPA) in high saline polycarbonate plant wastewater (PCW). The main operating conditions of the WAO process that affects the degradation efficiency, including temperature, total air pressure and reaction time were studied. The results indicate that complete BPA degradation is achieved in pH 8.5, temperature = 150 • C, total air pressure of 3 MPa and 120 min. In addition, by prolonging the reaction time to 24 h, removals of 62% and 37%, were obtained regarding chemical oxygen demand (COD) and total oxygen carbon (TOC), respectively. The intermediates of BPA degradation generated in aqueous solution by the WAO process were identified and the proposed plausible mechanism was reported. Under optimum experimental conditions, the biodegradability of treated PCW after WAO process was shown to significantly improve, by analysis of biodegradability index, including BOD 5 /COD ratio, values of average oxidation state (AOS) and carbon oxidation state (COS). The WAO process was found to be an effective method to degrade highly toxic organic matter in high saline industrial wastewater such as PCW. The results indicate that WAO, as a pretreatment technology, is an economic and eco-friendly method for the treatment of PCW.

Catalytic wet air oxidation of high BPA concentration over iron-based catalyst supported on orthophosphate

“…This result is explained by the fact that the aromatic structure of the phenolic compounds gives them a high activation energy for WAO. Consequently, higher reaction temperature is required to get over such high activation energy barriers (Mirzaee et al, 2018). In order to avoid excessive temperature conditions and thus reduce the cost, the use of a catalyst is necessary to improve the conversion of BPA and to avoid the formation of by-products.…”

Magnetic titanium/carbon nanotube nanocomposite catalyst for oxidative degradation of Bisphenol A from high saline polycarbonate plant effluent using catalytic wet peroxide oxidation

“…9) . It is reported that BPA degradation in AOPs technologies, such as in the CWPO process, may proceed through different mechanisms, including CO 2 elimination, dihydroxylation, cleavage of CeC bond, OH group addition and oxidation mechanism [2,55]. Fig.…”

“…Polycarbonate plant wastewater (PCW) is typically characterized by high levels of aromatic hydrocarbons and phenolic substances, such as Bisphenol A, as well as high concentrations of salinity, inorganic dissolved salts and total dissolved solids (TDS) [1][2][3]. Bisphenol A (2, 2-bis (4-hydroxyphenyl) propane, BPA), characterized by two phenolic rings joined together through isopropylidene as bridging group, is a main industrial chemical widely used in plastic industry as intermediate in the manufacturing of polycarbonate and in the production of epoxy resins and corrosion-resistant unsaturated polystyrene resins [4,5].…”

“…The classical Fenton oxidation process, one of the well-known and most effective homogenous AOPs, is considered a particular type of CWPO, which in this case, using the specific catalyst at the specific operating conditions, based on Eqs. (2) and (3), the chemical reaction between homogenous Fe (II) and H 2 O 2 under strong acidic condition (pH = 2.5-4) results in the formation of HO % radicals.…”

Removal of Organics from Landfill Leachate by Heterogeneous Fenton-like Oxidation over Copper-Based Catalyst

“…If mineralization is achieved during the Fenton reaction, the TOC decreases but if only partial oxidation occurs it remains constant with a decrease of the COD [52]. In addition, AOS (average oxidation state) and COS (carbon oxidation state) parameters have been evaluated for a better understanding of the degree of oxidation of a process [53][54][55].…”